Pulp grinder



CROSS REFERENCE EXAMIN March 11 1924.

G. J. MANSON PULP GRINDER Original Filed March 15 1919 2 Sheets-Sheet 1 Jim/Emma March 11 1924. 1,486,352

G. J. MANSON PULP GRINDER Original Filed March 15 1919 2 Sheets-Sheet 2 V surfa on the line 4-4 of in an axial direction.

Patented Mar. 11, 1924.

UNITED STATES enema um menu, or rename, orrrmo, cums.

PULP GRINDER a uua n fled mi: 15, 1a, Serial 1i. seam. 1...... August 14, me.

To all whom it may concern." K

Be it known that I, Gnoaoa Jamie son, a subject of the King of Great Bntam, and resident of Toronto, in the Province of Ontario, Dominion of Canada, have invented certain new and useful Improvements in Pulp Grinders, of which the following is 'a specification.

This invention relates to improvements in pulp grinders, and the objects of the invention are to rovide a sim 1e and effective form of grinding in which relativelK long fibres may be produced and in whic the entire grinding surface will be availed of in the grinding operation.

The grinder is especially designed to be used in the production of fibres from sawmill waste, such as slabs, edgings, saw dust, shavings and the like which has prev1- ousl been chipped to suitable size.

e invention consists essentially of the grinder construction all as hereafter arranged and shown in detail in the accompanyinlg sgecification and drawings.

In t e rawings:-

Figure 1 shows an elevation partly in section of the grinder.

Figure 2 is a detail in end of the grinds 1 v Figure 3 1s an nd view of the surface of the grinding stone.

Figure 1s a section throu plan showing one h the grinding igure 3. Figure 5 is a section of the grinding surface on the line 5-5 of Figure 3.

Figure 6 is a swtion throu h the grinding surface on the line 6-6 of igure 3.

Figure 7 is a section through the grinding surface on the line 7-7 of Figure 3.

Referring to the drawings, A represents a suitable base having standards 10, 11 and 12 which support the shaft B ada ted to be turned by a convenient source 0 power conveniently applied to the shaft through the pulley 13.

Means are provided for admstmg the shaft The well known means which I show to accomplish this purpose com rise a hand wheel 14 ada ted to turn a pmion 15 which meshes wit gears 16 and 17 connected to screw shafts 18 and 19 which extends through a travelling element 20 which has a collar 21 fitting between the collars 22 and 23 on the shaft B. Ball bearings 24 are shown between the collar 21 and the collars 22 a'nd 28. Any other convenient and well known means for adjusting the shaft in a lengthwise direction may be emgloyed."

represrnts the rotary inding element which is conical in form, t e outer surface being substantially at an angle of to the axis. This element is secured to and rotates with the shaft B and is adapted to cooperate with the fixed element D of the grinding pair which is secured to the fixed casing E. a

Material is adapted to be fed between the 'ndin element from a feeding chamber 0 at t e small end of said members and the ground pulp is adapted to be withdrawn from the larger peripheries of the grinding pair from the outlet box 31. The passage 0 material between the grinding stones may be facilitated by a screw blade 32.

The grinding elements may each be manufactured of stone, I prefer to manufacture them from a mixture of cement and sharp, sand, about 50% of each mixed with about 10% of saw dust to form voids.

In some cases one of the elements'may be made of cast metal such as cast iron.

The rotary grinding element C is provided on its surface with a (plurality of feeding grooves 33 which exten in a spiral manner around the peri ihery and are gradually decreased in dept from their commencement at the small end of the cone to their end near the large end of the cone, this gradual decrease being indicated in the sectional views Figures 4 to 7. The groove at its commencement is formed substantially rectangular with the side walls open- 1n downwardly slightly the .an le of the 'si e walls are gradually increase and they are converged at the bottom until the grooves run out. This is the fact of gradually form;

ing the stock out between the To assist in the distribution of the stock, a plurality of subsidiary grooves 34, 35 and 36 are provided for each principal groove 33,

these subsidiary grooves extending parallel mill waste, it is first chipped and then mixed with water until the contains about nding sub faces as it is fed by centrifuga force.

11 of band Magi water. This fed y gravity ween e mdmg sur aces at the thereof. 1e space between the grindinfble niefit is $6 set'that there will t5 also be a space for a plurality of fibres 1 between the surfaces in this wa relatively long fibres are produced due to fact that the comminutatlon is produced rather by the fibres rubbwne against the other. than rub directly between the grind- .e is fed continuously in order that there may be at all time a continuous film of stock between the surfaces.

. it As many changes could be made" in the above construction, and many apparently widely different embodiments of my inven-' tion within the scope of the claims, constructed without departing from the spirit or scope thereof {it is intended that all mat- 2o ter contained in the above cation andaccompanying draw be interpreted as illustrative and not in a limi sense.

' GEORGE JAMES MANSON.

Witness: RUBSEL S. Sm. 

